<%--
  Created by IntelliJ IDEA.
  User: 754165242
  Date: 2022/3/7
  Time: 20:29
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%--
           pageContext:页面域对
           request:请求域
           session:会话域
           application:应用域
    --%>
<%out.print(request.getAttribute("msg"));%>
<%=pageContext.getAttribute("msg")%>
<%=request.getAttribute("msg1")%>
<%=session.getAttribute("msg2")%>
<%=application.getAttribute("msg3")%>
</body>
</html>
